Threading device.



C. F. SCHULTIS.

THREADING DEVICE.

APPLICAHON FILED APR-10,191]. L153,8%5, PatentedSept. 14, 1915.

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COLUMBIA PLANOGRAPH la-WASHINGTON D c TED @TitTEE UFFTEEW I CHARLES E. SCHULTIS, OF CLEVELAND, OHIO, ASSIGNOR '10 CHRISTIAN GIRL, 0F

CLEVELAND, OHIO.

TI'IREADING DEVICE.

Application filed April 10, 1911.

devices, and particularly to devices or tools of this class which embody dies for cutting threads and wherein the dies are adapted and constructed to open automatically.

One of the objects of this invention is to provide simple, efficient and conveniently operated means whereby the dies proper may be closed after having been once opened, without any necessity for suspending the operation of the machine.

A further object of the invention is to provide an improved construction of die proper.

These objects are accomplished by the c0nstruction illustrated in the drawings forming part hereof, wherein Figure 1 represents a central longitudinal section taken through a device constructed in accordance with my invention; Fig. 2 rep resents a view of the front end of the device, the upper half being shown in section and certain parts being broken away; Fig. 3 represents a side elevation of the device, with parts broken away to reveal the internal construction; Fig. 4 represents a transverse sectional view of my device corresponding to the line 44 of Fig. 1; Fig. 5 is a view similar to Fig. 2 showing the dies in open position; and Fig. 6 is a sectional detail taken through the front of the device and through one of the die-carrying levers.

The tool or device illustrated herein is a die stock which is adapted to bemounted in a machine, especially a machine in which the tool is rotated, although it may be mounted in a machine in which-the tool is fixed and the work rotated. In general construction it is similar to the device shown in my application No. 596,199, filed December 8, 1910.

Describing the various parts by reference characters, 1 denotes the shank of the tool, said shank having a head 2 preferably integral therewith. The shank is provided with Specification of Letters Patent.

Patented Sept. 14, rare.

Serial No. 620,102.

a central bore 3 which is shown as merging with an enlargement or chamber 4, which enlargement or chamber merges in turn with a chamber 5 formed within the head.

The head proper is provided with a pair of opposed recesses 6 extending from the outer periphery thereof and communicating with the chamber 5, said recesses forming guidewaysv for apair of levers 7, which are constructed and secured in place as follows: Each lever has formed at its front end, and preferably integral therewith, a die-carrying head 8 which is generally semi-cylindrical in shape, the semi-cylindrical interior surface of each head forming a seat for a die or chaser 9. Each die or chaser is generallv semi-cylindrical in shape and 15 provided with the cutters 10. In order to adjustably mount each die within its seat, I provide each with a pair of recesses 11,.each having a V-shaped seat 12 which seatsconverge inwardly or toward the center of the tool and extend preferably to the adjacent radial inner face 9 of each die. These seats receive each the point of a screw 13, said screws being mounted within the head 8, adjacent to the radiallv extending. facesll of such head. Intermediate of these recesses 11 each die is provided with a conical notch for the reception of the correspondingly shaped end of the screw 15. which is mounted in the head 8. Both heads 8 are substantiallv identical in construction and each of the dies is constructed and supported in the same manner.

It will be apparent that the construction described provides a particularly firm support for the dies and one which enables them to be adjusted toward or from each other as well as circumferentiallv within their respective seats, such adjustment being obtained by manipulating the screws 13 and 15. Each lever is provided near its rear end with a radially extending recess 16 within which there is inserted a coiled spring 17, adapted to hear at one end'against the bottom of the recess and with its other end against a shell 18, which is secured tothe rear portion of the head 2 and incloses the major portion of said head and the levers 7 Each lever is provided with a recess 19 extending rearwardly from the front face thereof and forming a guideway for the sliding block 20. ,Each of the blocks is mounted inthe head 2 by means of a pin 21 extending through elongated slots 22 in each lever 7 and having-its end portions anchored in seats 23 provided in said head. In the rear portion of each recess there is mounted a coiled spring 24, one end of which is adapted to bear against the bottom of the recess and the other end against the block 20. The rear ends of the levers normally bear against a head or abutment 25 which is secured to the rod 26 by a set screw 2?, which prefera ly x ds t r th heeel' an ugh th a pertien t e sh l Th a 1 end of the rod 26' isengaged by one end of t e c ile spr n 28 ted t n the e ss and ear g a it pp i n aga n t. the are dfv o ai r e- Th ron e of red prei n o h chamber 5, being located short distance behind the dies The head or abutment 25 is provided with a reduced extension 2 5 proi eting in n l s ideel by t e r e s The fes f end is t uei i' i ngage y n e i f a oiled, p ng th "oppo nd f w i h a s a ai st th to f h recess 4;.

fhe shell 18 does, not extend the full length of the head 2 but terminates a s uflicient distance f 'omthe front end of said head to rovide. a seat on said head for a ring 30. This ring will be applied to the head in advance of'the shell 18, being slipped on from the rear, and will be retained in place means of a fiange 31 on the head engaging a seat 32 on the ring (see Figs. 3 and 6'), The ring is provided with a face 33 forming ineffect air extension of the front face of the head 2 and with an annular flange 34: projecting forwardly beyond and overhanging the front end of the head.

35 denotes a pair of rollers mounted in recesses provided within the body of the ring 30 and projecting forwardly, under the flange ea, 'theinner' surfaces of'the rollers being about flush with the outer surface of the n e 3 en t e h ed 2 a d. P t ng ward substantially the same distance as the flange Each lever head 8 has formed, at the rear end thereof, a pair of recesses the bottoms of which areformed by oppositely inclined faces 36, the junction of said faces being line preferably inthe cylindrical eX- terior. surface of the headf If desired, a piece of hardened steel 37' may be set into a recess adjacent,v to the junction of the faces 36;, said piece of steel having its upper portio'nreversely beveled to form continuations of such faces; In the. drawings, the details discussed are shown in one of the heads 8, but it will be understood that the other: head is similar in construction to the one thus illustrated, f l U As indicated in Figs. 1, 3 and 6, the head 2 may be provided with a suitable aperture 38, located back of the dies, for the discharge of chips, the shell being provided with a similar opening 39 registering with the opening 38.

lVith the parts constructed as illustrated and described, the operation will be as follows: The rod 26 will be adjusted with respect to the length of thread to be out upon the work. When the work engages the front end of the rod 26, whether the work be fed toward the tool or vice versa, the rod will be thrust rearwardly against the action of the springs 28 and 29, carrying with it the abutment 25. As soon as the front edge of the abutment clears the rear ends of the levers 7', the springs 17 will rock the rear ends of the lovers inwardly, separating the dies, as shown in Figs. 3 and 5. Or, suppose the thread has been cut as far as possible upon the work, further advance being prevented by the stop usually provided; further rotation of the work or the tool, as the case may be, will produce a forward pull upon the levers 7, due to the engagement of the die threads with the threads on the work. This will pull the levers 7 forwardly, through the manner of mounting the lovers upon the pins 21, until the rear ends of the levers are moved in front of the abutment 25, when such ends will be thrown inwardly by the action of the springs 17, in the same manner as when the rod 26 is pressed rearwardly. In order to close the dies after they have been opened, if the tool is stationary, the operator merely rotates the ring 30 by hand, causing the rollers 35 to ride up the proper inclined surfaces 36 until they reach the top of the inclines, when the rear ends of the levers, 7 will be elevated a sufficient dis.-

tance to allow the abutment 25 to be moved thereunder, or the rear ends of the levers will be moved over said abutment by the springs 24, as the case may be. It will be obvious that the inclined surfaces 37 must be of such length as will permit the longitudinal movement of the levers without bringing the rear ends of the inclined surfaces 36 out of operative relation with the rollers 35. When the dies are operating upon the work, the rollers will be in the recesses provided therefor, at one side or the other of the block 37. If the tool is rotating, in order to close the dies will be necessary only to check the rotation of the ring 30, either by grasping the same or by applying a brake thereto in any suitable manner. This will allow the inclined surfaces 36 to rotate under the nection between each member and its support, means operating to automatically separate the die-carrying portion of said members, and rotatable means for resetting said members, said resetting means being freely rotatable in either direction without obstruction and adapted when rotated in either direction to reset said members. I

2. In a device of the character set forth,

the combination of a head, levers pivotally supported within said head, dies carried by said levers, means tending to separate the die-carrying portions of said levers, and a ring rotatably mounted on said head and having means arranged when rotated in either direction to engage the outer portions of said levers to move them inwardly or toward each other, said ring being fully rotatable in either direction after the movement of said levers to inward position.

3. In a device of the character set forth, the combination of a head adapted to be secured to the live spindle of a power tool, die-carrying members supported by said head, means tending to separate said members, and means carried by said head and adapted to move said members inwardly or toward each other, said last means being operable during the rotation of the head.

4. In a device of the character set forth, the combination of a head, levers pivotally supported by said head and having inclined portions ending in narrow apices, means tending to separate the outer or die-carrying portions of said levers, a ring rotatably mounted on said head, rollers carried by said ring and adapted to engage the inclined portions of said levers, whereby the relative rotary movement between the head and the ring in either direction will move the outer ordie-carrying portions of the levers toward each other, and spring operated means for retaining the levers in inward position.

5. In a device of the character set forth, the combination of a head, a shell inclosing the rear portion of said head, a ring rotatably mounted on said head in front of said shell and projecting beyond the front of said head, levers pivotally supported by said head and projecting beyond the front end of the same, the peripheral portions of said levers being inclined laterally in both directions, dies carried by said levers, means tending to separate the front ends of said levers, engaging devices carried by said ring and adapted to engage the inclined portions of the levers and force the same inwardly or toward each other, and spring operated means for retaining the levers in inward position, said ring being freely rotatable after the locking of the levers.

6. In a device of the character set forth, the combination of a head, a shell inclosing the rear portion of said head, a ring rotaof the same, said levers having doubly sloping portions, dies carried by said levers, means tending to separate the front ends of said levers, projections carried by said ring and adapted to engage the sloping portions of the levers and force the same inwardly or toward each other, and snap means separate from said ring for locking said levers in inward position.

7. In a device of the character set forth, the combination of a head, a ring rotatably mounted on said head adjacent the front end thereof, levers pivotally supported by said head and projecting beyond the front end of the same, dies carried by said levers, means tending to separate the front ends of said levers, each of said levers being provided with a recess having doubly inclined faces overhung by said ring, and projections carried by said ring and overhanging the recessed portions of each lever, and arranged to return said levers to inward position at the instant of arriving at the termination of said inclined portion, and means independent of said ring for locking said levers in inward position whereby said ring may be permitted to rotate freely.

8. In a device of the character set forth, the combination of a head, a member rotatably mounted on said head adjacent the front end thereof, die-carriers projecting beyond the front end of the head, means tending to separate said carriers, each of said carriers being provided with inclined recesses extending in opposite directions from a sharply defined point in the outer face thereof which is overhung by said member, projections carried by said member and overhanging the recessed portions of each carrier, and means independent of said ring for locking said levers in inward position at the arrival of said projections at said point, said ring being thereafter freely revoluble upon the head.

9. In a device of the character set forth, the combination of a head, a member rotatably mounted on said head, a die-carrier, means tending to force said carrier outwardly, said carrier having a recess provided with an inclined face and said member having a projection adapted to ride along such incline to force the carrier inwardly, and means independent of said ring for locking said levers in inward position upon the arrival of said projection at the termination of such incline, said ring being thereafter freely revoluble upon the head.

10. In a device of the character set forth, the combination of a head, a member rotatably mounted on said head, a die-carrier having a recess pmv ded wi h a Pair f QB- In te timo y wh o hereunto afiix my pqsitekllyiinc ined' ac s and, a hlfigfi il ffifitd the P12633116? o We itn@s$esin carrier att. juns i n a aims, and means tending tQ fqrce said, arrier 0,1 3 CHARLES SGHULTIS' W ly, aid m mber having a mr ifln wi ne gs:

adapted t0 ride along s ch i cl n s to. qm J? B HULL,

theaarrier nwardly, BBE SNAN 3-. WEST- ems 9 this 2 1M; may 'be taimsd, x fi cen each; y a re s ng h w mmiss qncr o r tent 

